recitation 4

Materials used for Steps 1 and 2

  • 1 * 42STH33-0404AC stepper motor
  • 1 * SN754410NE ic chip
  • 1 * power jack
  • 1 * 12 VDC power supply
  • 1 * Arduino kit and its contents

During this recitation, we had two steps, and the first step required independent working. For the first part of the process for making a drawing machine, I connected all the materials that are listed above that were essential to make the circuit, with the help given by the schematic diagram. The objective of the h-bridge in this circuit was for it to allow speed and direction control. The main purpose of the circuit was for the motor to make a revolution, which was done so by the given code.

The Process

After testing the code and confirming the circuit worked, I then added a potentiometer to allow myself to control the motor, rather than the computer doing so in a timely order. After, I needed to modify the code for the potentiometer to let it satisfy the stepper motor we were given, which was a 200 step motor. After modifying the code, the movement of the knob matched the rotation of the motor.

Materials used for Step 3 

  • 2 * Laser-cut short arms
  • 2 * Laser-cut long arms
  • 1* Laser-cut motor holder
  • 2 * 3D printed motor coupling
  • 5 * Paper Fasteners
  • 1 * Pen that fits the laser-cut mechanisms
  • Paper

After completing steps 2 and 3, I paired up with my partner to collaborate our circuits and create one drawing machine. We used all the materials listed above to create “mechanical arm” that held the marker, while it was connected to the motors. After adjusting the mechanical arm, we were able to turn the motors and draw using the machine. One minor problem we faced while creating the machine is that we adjusted the short and long arms the wrong way, which did not allow the motors to run smoothly with one another. After realizing the mistake we had made, we adjusted the arms to allow the motors to run smoothly work with another and make a successful drawing machine. 

Final Drawing

Question 1

One machine I would be interested in building is a toilet paper holder that alarms you before it runs out. This would require a sensor in order to sense the amount it has left in it. This object can be manipulated to look like an ordinary holder.

Question 2

One art installation that compares to the drawing machine that I made in class was Scratch Series by Shawn Decker. This installation portrays various rhythms by using microcomputer-governed motors. This relates to the drawing machine in a sense that the motors are working together to make something, and in the installation it was a rhythm, whereas in the drawing machine, it was a drawing.  The actuators that were used for his project allowed it to “pull the scratches back and forth” to reflect patterns, which was very impressive, in my opinion.


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